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Prosecutors expect charges to be filed today against a suspect being questioned in the kidnapping and murder of Griffith, Indiana businesswoman Mary Austgen, 76.

People in Griffith who knew the victim are relieved an arrest has been made.

Austgen was attacked and kidnapped at gunpoint from her family business on March 28. She was found shot to death the next day inside her SUV in the parking lot of the Majestic Star Casino in Gary.

Investigators say a tip led them to search a home in the 12200 block of Lawndale Avenue in south suburban Alsip Tuesday evening.

The arrest came a day after Austgen’s family made a public plea for help in finding her killer, reminding everyone that a $10,000 reward was being offered for information.

Police also released photos of two distinctive rings that were taken from Austgen at the time of her murder. But police say those photos did not lead them to the suspect.

Earlier in the investigation police released photos of a man who was caught on surveillance camera at Austgen’s business on the day of her disappearance. A half hour later that same man was seen on casino surveillance video arriving in the parking garage with Austgen, and 40 minutes after that he was seen getting into a black 4-door car and driving off with someone else.

“Whoever was in that black 4-door vehicle, we would still like to speak with that person,” said Griffith police Detective Lt. Matthew Argadine.

Griffith police are not saying if that person they want to talk to could face any charges — only that they want to speak to them. They are expected to file charges against the person who was arrested Tuesday evening.